DNA

DNA stands for deoxyribonucleic acid. It's like a really long code in your cells. You can think of each letter like a piece of a puzzle. Together, the letters make up a message that your body can use to make you who you are. DNA is like a set of instructions for your body - it tells it what proteins it needs to make, how it should grow, and how it should work. Every person has a different set of instructions in their DNA, which makes everyone special.